A dispenser assembly for dispensing a sheet from a roll of sheet material, which defines a cavity extending longitudinally, includes: a roll holder for removably holding the roll of sheet material being free to rotate relative to the roll holder; a base for supporting the roll holder and for coupling the dispenser assembly with an environment structure; and a pair of coupling elements including a first element coupled to the roll of sheet material and a second element integral to the roll holder. The first element is coupled in a free to rotate and removable manner relative to the second element by magnetic coupling. The first element includes a longitudinally extending engaging portion which is arranged to at least partially engage with an end portion of the cavity of the roll of sheet material so that the first element is fixedly secured to the roll of sheet material.